As far as we know only Madara and later Obito have ever controlled the nine tails. When a tailed beast or animal is being controlled by the sharingan. The sharingan pattern get reflected on the victim's eyes.
When obito controlled kurama the sharingan pattern was reflected but it changed and kurama's pupil dilated.
When madara controlled the kyuubi, its pupils didn't dilate.
As one can see from the above scans, Obito's control causes kurama's pupils to dilate while madara's does not. Now some of you might think this is a minor thing but kishi dilibirately drew 3 panels showing kurama's eyes goin from its normal pattern to the sharingan pattern and finally the dilated sharingan pattern. I think there might be a reason for this.
Perhaps Obito's control over the nine tails is more absolute than madara's. Granted madara can also control the kyuubi well enough. It could be that obito's genjutsu skills might be better than madara's( I don't know this for a fact mind you).
Thoughts?
When obito controlled kurama the sharingan pattern was reflected but it changed and kurama's pupil dilated.
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When madara controlled the kyuubi, its pupils didn't dilate.
You must be registered for see images
As one can see from the above scans, Obito's control causes kurama's pupils to dilate while madara's does not. Now some of you might think this is a minor thing but kishi dilibirately drew 3 panels showing kurama's eyes goin from its normal pattern to the sharingan pattern and finally the dilated sharingan pattern. I think there might be a reason for this.
Perhaps Obito's control over the nine tails is more absolute than madara's. Granted madara can also control the kyuubi well enough. It could be that obito's genjutsu skills might be better than madara's( I don't know this for a fact mind you).
Thoughts?